JPS6329367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum sheath breaker, and more particularly to a vacuum sheath breaker in which an axial magnetic field parallel to the arc is applied to an arc generated when electrodes come into contact and separate.

In recent years, in order to prevent the concentration of arcs that occur between electrodes when contacting and separating (contacting and separating) electrodes, so-called longitudinal magnetic field systems have been developed that are equipped with a coil electrode on the back of the contact electrode that applies an axial magnetic field in the same direction to the arc. However, since the direction of the magnetic field applied to the arc is in the same direction, the magnetic field at the center of the electrode is stronger than that at the periphery. Together, this causes a phase delay due to the eddy current near the center of the electrode, and the magnetic field due to the eddy current remains even after the current is cut off, which not only causes poor insulation recovery characteristics but also the risk of overheating due to the eddy current. be.

In order to deal with this problem, a contact electrode is provided with a plurality of radial slits, a coil electrode is provided to generate axial magnetic fields in different directions, and the coil electrode is connected to the center of the back of the contact electrode. A vessel has been proposed.

However, such vacuum shields and disconnectors have a plurality of slits in the contact electrode, which reduces its mechanical strength, and the radial connection arm of the coil electrode to the contact electrode and electrode rod Since the coil electrodes are spaced apart from each other in this direction, there is a risk that the axial dimension of the coil electrodes will become large.

The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the mechanical strength of the contact electrode in a vacuum shield switch equipped with coil electrodes that generate axial magnetic fields in different directions. It is an object of the present invention to provide a vacuum shield and disconnector which can reduce the axial dimension of a coil electrode. Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a vacuum shield disconnector according to the present invention, in which both ends of a cylindrical insulating tube made of an insulating material such as glass or ceramic are hermetically sealed by disk-shaped metal end plates. Inside the vacuum container 1, which is stopped and evacuated to a high vacuum, there are fixed pairs of contact electrodes and coil electrodes, as described later.
A pair of fixed and movable electrode rods 4 and 5 are introduced so as to be able to move relatively toward and away from each other in order to move the movable electrodes 2 and 3 toward and away from each other at the axial center. In addition, fixed and movable electrodes 2,
3 has almost the same configuration, so only the configuration of the movable electrode 3 will be described below, and the components of the fixed electrode 2 that have the same functions as those of the movable electrode 3 will be given the same reference numerals, and the explanation thereof will be omitted.

At the inner end axis of the movable electrode rod 5, there are shown in FIG.
As shown in FIGS. 3 and 6, a circular recess 6 is provided, and the base of a resistance spacer 7 is appropriately joined to the bottom of the recess 6. The resistance spacer 7 is made of an insulating material or a metal resistor, and has a cylindrical shape having a length approximately equal to the depth of the recess 6, a diameter appropriately smaller than the inner diameter of the recess 6, and a partition wall 7a near the end. Gas vent holes 8 and 9 are provided in the outer periphery and in the partition wall 7a, respectively, for joining the resistance spacer 7, the movable electrode rod 5, and a connection spacer to be described later. At the end of the resistance spacer 7, there is provided a connection spacer 1 made of a metal conductor formed in a cylindrical shape having approximately the same diameter as the outer diameter of the resistance spacer 7.
The base of 0 is fitted and joined as appropriate. Note that the protrusion length of the connection spacer 10 is set larger than that of the coil electrode described later.

At the inner end of the movable electrode rod 5, an inner ring 11 made of a metal conductor formed in a ring shape with an inner diameter approximately the same as the inner diameter of the recess 6 concentrically surrounds the connection spacer 10. The inner ring 11 is formed into an annular shape with ends by a groove 12 cutting the inner ring 11. And inner ring 1
On the outside of the ring 1, an outer ring 13 made of a metal conductor and formed into a ring shape with a suitably larger diameter than the inner ring 11 is arranged concentrically. The inner ring 11 and the outer ring 13 are coil electrodes 1 that generate magnetic fields in different axial directions (vertical direction in FIG. 3).
4, the outer ring 13 is electrically connected to the inner ring 11 by a first connecting arm 15 extending radially outward from the outer periphery of the inner ring 11, which is symmetrical to the groove 12. Further, the outer ring 13 is inserted through the groove 12 of the inner ring 11 and the first connecting arm 1
It is electrically connected to the connection spacer 10 by a second connection arm 16 extending in the radial direction (in the left-right direction in FIG. 3) in the same plane as the connection spacer 5 . Note that a notch 5a is provided at the end of the movable electrode rod 5 corresponding to the groove 12 of the inner ring 11 so that the second connecting arm 16 and the movable electrode rod 5 do not come into contact with each other.

A contact electrode 17 formed approximately in the shape of a disk is fitted into the end of the connection spacer 10 through a recess 18 provided at the center of its back, and is joined by brazing or the like. The contact electrode 17 constitutes the movable electrode 3 together with the coil electrode 14, and its contact surface (upper surface in FIG. 3) has a circular recess 19 having an inner diameter equal to or larger than the outer diameter of the inner ring 11. is provided at the center, and an arc surface 20 is provided near the outer periphery, the arc surface 20 being inclined so as to become gradually thinner as it approaches the outer periphery.

When an arc A is generated on the contact surface of the contact electrode 17 due to the above configuration, the current flowing through the arc A reaches the second connecting arm 16 via the connecting spacer 10, and 1/2 from the second connecting arm 16. and flows into the outer ring 13. The currents flowing through the outer ring 13 in different directions reach the first connecting arm 15 and join together, and the inner ring 11
is divided into different directions again and flows to the movable electrode rod 5. Therefore, the first and second connecting arms 15, 16
Therefore, axial magnetic fields in mutually different directions (different polarities) are generated in the space surrounded by the inner ring 11 and the outer ring 13, which are divided into two. Therefore, the magnetic fields near the center of the contact electrode 17 cancel each other out, and no phase delay or the like due to eddy current occurs in this area.

4 and 5 are a plan view and a longitudinal sectional view of a second embodiment of the main part of the present invention. FIG. 7 is a partially exploded perspective view of the second embodiment. The coil electrode 14 of this embodiment is different from that of the first embodiment described above.
The only difference is that the current flowing through the outer ring 13 is divided into 1/4, whereas the current flowing through the outer ring 13 is divided into 1/4. .

That is, the inner ring 11 is provided in a pair of semicircular arc shapes with grooves 12a and 12b provided at symmetrical positions with the center as a point of symmetry, and each groove 12
a, 12b, the connection spacer 10 and the outer ring 1
The second radial connection arm 16a, 1 that connects the
6b are inserted through each. The inner ring 11 and the outer ring 13 are connected to each second connecting arm 16.
The first connecting arms 15a and 15b extend in the radial direction orthogonal to the first connecting arms 15a and 16b.

As described above, the present invention introduces an electrode rod into a vacuum container in such a way that it can approach and separate a pair of contact electrodes from each other at its axis, and at least one of the electrode rods and the contact electrode can be brought into contact with and separated from each other. In a vacuum shield disconnector connected by coil electrodes that generate axial magnetic fields in different directions by changing the current path flowing through the rod, a resistance spacer is housed in a recess provided in the axial center of the inner end of the electrode rod. At the same time, a connection spacer is coaxially joined to this resistance spacer so as to protrude from the recess, and an inner ring attached to the inner end of the electrode rod and an outer ring having a larger diameter than this inner ring are attached to the outside of the connection spacer. A coil electrode consisting of a ring is arranged concentrically, and the connection spacer and the outer ring are connected by a radial first connection arm that passes through a groove provided in the inner ring. A contact electrode formed in a disk shape is attached to the end of the connection spacer, and a recess larger than the outer diameter of the inner ring is provided in the center of the contact surface of the contact electrode. Therefore, the mechanical strength of the contact electrode can be increased, and the arc can be uniformly dispersed without being concentrated at the center of the contact surface of the contact electrode where no magnetic field acts. Furthermore, since the electrode rod of the coil electrode and the connecting arm for the contact electrode can be arranged in the same plane perpendicular to the axial direction, it is possible to reduce the axial dimension of the coil electrode.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a vacuum shield breaker according to the present invention, FIG. 2 is a plan view of the first embodiment of the main part of the present invention, FIG. 3 is a cross-sectional view taken along the line - 4 is a plan view of the second embodiment of the main part of the present invention, and FIG.
The figure is a sectional view taken along the - line in FIG. 4. 6th
The figure is a partially exploded perspective view of the first embodiment, and FIG. 7 is a partially exploded perspective view of the second embodiment. DESCRIPTION OF SYMBOLS 1... Vacuum container, 4, 5... Electrode rod, 6... Recess, 7... Resistance spacer, 10... Connection spacer, 11... Inner ring, 12... Groove, 13... Outer ring, 14... ... Coil electrode, 15 ... First connection arm, 16 ... Second connection arm, 17 ... Contact electrode, 1
9... Concavity.

Claims (1)

[Claims] 1. An electrode rod is introduced into a vacuum container so that a pair of contact electrodes can come into contact with and separate from each other at the axial center thereof, and a current path flowing through the electrode rod can be established between at least one of the electrode rods and the contact electrode. In vacuum shields and disconnectors connected by coil electrodes that generate axial magnetic fields with different directions,
A resistance spacer is placed in a recess provided in the axial center of the inner end of the electrode rod, and a connection spacer is coaxially joined to the resistance spacer so as to protrude from the recess, and the electrode rod is placed on the outside of the connection spacer. A coil electrode consisting of an inner ring attached to the inner end of the inner ring and an outer ring having a larger diameter than the inner ring is arranged concentrically, and the connecting spacer and the outer ring are inserted into a groove provided in the inner ring in the radial direction. The inner ring and the outer ring are connected by a first connecting arm, and the inner ring and the outer ring are connected by a second connecting arm in the radial direction. A vacuum disconnector characterized by having a concave portion larger than the outer diameter of the inner ring in the center of the contact surface of the electrode.